This only happened to me once... a few years ago with my collie. My dad put that NoNix stuff on it... the stuff that comes in a little chalk looking thing, to make shaving nicks stop bleeding. It worked for us... might be worth a shot.

Styptic powder or you can buy it as a jar of cloth pads that are impregnated with a liquid styptic solution. Most pet stores sell it. If you really cut it good, it will take a couple of applications to stop the bleeding. If Ruby will wear an old sock that will help to keep her from licking her nail and making it bleed again that'll help. Corn starch will sometimes do it too.

I have used the liquid stuff and it didn't work as well as the powder. I actually had one of my chickens lose a nail......thought she was going to bleed to death, it took a lot of styptic powder to get it to stop but it did finally. It works very fast, usually in seconds.